Slick, PLEASE, if your kitten is at home, get him back to the vet IMMEDIATELY without a moment's delay.
And talk to the vet about a referral to s specialist NOW. If you don't do everything in your power to get your kitten to another vet there is a good chance you may lose him.
Do not try to force feed, pack up your kitten and take him back to the vet NOW! PLEASE!